append vs extend method in python | append() method & extend() method in Python | Interview Question

Published: 15 January 2026
on channel: REGex Software

Are you confused about when to use .append() versus .extend() in Python? While they might look similar, using the wrong one can lead to unexpected nested lists and bugs in your code!

In this tutorial, we dive deep into the technical differences, memory implications, and the best use cases for each method. Whether you are a beginner or looking to optimize your Python performance, this guide has you covered.

What you’ll learn:

The fundamental definition of append() and extend().

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